The fact that the brain of a human infant is less than 30 percent of its adult size is a consequence of:

Question

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The evolution of erect bipedalism necessitated a narrower pelvis in humans, limiting the size of the birth canal. This, in turn, required that human infants be born at an earlier stage of brain development, resulting in brains that are less than 30 percent of their adult size at birth to accommodate the passage through the birth canal.

The Fact That the Brain of a Human Infant Is